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%I #6 Mar 30 2012 16:48:51
%S 62,3920,130560,3058544,56925214,900355884,12619939046,161208191596,
%T 1913821820768,21416926011756,228320059956022,2337581305737496,
%U 23128907576991302,222266054948571020,2082868947950189248
%N Number of polygons of length 2n with 3 (self-avoiding polygon) holes on square lattice (not allowing rotations).
%H I. Jensen, <a href="/A056639/b056639.txt">Table of n, a(n) for n = 16..45</a> (from link below)
%H I. Jensen, <a href="http://www.ms.unimelb.edu.au/~iwan/polygons/series/square.perim.3hole.ser">More terms</a>
%Y Cf. A002931.
%K nonn
%O 16,1
%A _N. J. A. Sloane_, Aug 30 2000
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